CN115873400B - PA6 composition and preparation method and application thereof - Google Patents
PA6 composition and preparation method and application thereof Download PDFInfo
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- CN115873400B CN115873400B CN202111157647.1A CN202111157647A CN115873400B CN 115873400 B CN115873400 B CN 115873400B CN 202111157647 A CN202111157647 A CN 202111157647A CN 115873400 B CN115873400 B CN 115873400B
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- 239000000203 mixture Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims description 9
- 239000004677 Nylon Substances 0.000 claims abstract description 33
- 229920001778 nylon Polymers 0.000 claims abstract description 33
- 239000003365 glass fiber Substances 0.000 claims abstract description 25
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 claims abstract description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 17
- TVIDDXQYHWJXFK-UHFFFAOYSA-N dodecanedioic acid Chemical compound OC(=O)CCCCCCCCCCC(O)=O TVIDDXQYHWJXFK-UHFFFAOYSA-N 0.000 claims abstract description 6
- 235000011037 adipic acid Nutrition 0.000 claims abstract description 4
- 239000001361 adipic acid Substances 0.000 claims abstract description 4
- 239000000314 lubricant Substances 0.000 claims description 9
- 229920002635 polyurethane Polymers 0.000 claims description 8
- 239000004814 polyurethane Substances 0.000 claims description 8
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 239000012752 auxiliary agent Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000012760 heat stabilizer Substances 0.000 claims description 3
- 239000002667 nucleating agent Substances 0.000 claims description 3
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 2
- 239000000446 fuel Substances 0.000 abstract description 10
- 150000003839 salts Chemical class 0.000 abstract description 10
- 230000009172 bursting Effects 0.000 abstract description 6
- 229920002292 Nylon 6 Polymers 0.000 description 33
- 230000000052 comparative effect Effects 0.000 description 14
- 239000003921 oil Substances 0.000 description 14
- 238000012360 testing method Methods 0.000 description 13
- 238000010521 absorption reaction Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 230000015784 hyperosmotic salinity response Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 4
- 238000005422 blasting Methods 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 3
- 239000003502 gasoline Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229920006875 PA6-C Polymers 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
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- 230000033228 biological regulation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- -1 copper halide Chemical class 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
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- 239000000178 monomer Substances 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- QFGCFKJIPBRJGM-UHFFFAOYSA-N 12-[(2-methylpropan-2-yl)oxy]-12-oxododecanoic acid Chemical compound CC(C)(C)OC(=O)CCCCCCCCCCC(O)=O QFGCFKJIPBRJGM-UHFFFAOYSA-N 0.000 description 1
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 241000021559 Dicerandra Species 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000005526 G1 to G0 transition Effects 0.000 description 1
- 235000010654 Melissa officinalis Nutrition 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Substances ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920006150 hyperbranched polyester Polymers 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000865 liniment Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
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- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- UTOPWMOLSKOLTQ-UHFFFAOYSA-N octacosanoic acid Chemical class CCCCCCCCCCCCCCCCCCCCCCCCCCCC(O)=O UTOPWMOLSKOLTQ-UHFFFAOYSA-N 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
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- 239000002861 polymer material Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 description 1
- 229910001379 sodium hypophosphite Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a PA6 composition, which comprises the following components in parts by weight: 70 parts of PA6;5-20 parts of PACM nylon; 10-50 parts of glass fiber; the PACM nylon is obtained by copolymerizing 4' 4-diamino dicyclohexylmethane, dodecanedioic acid and adipic acid, wherein adipic acid units account for 5-20mol% of the total mole percentage of diacid units, and the weight average molecular weight of the PACM nylon ranges from 15000 to 25000. After PACM nylon is added, the fuel resistance and salt resistance of the PA6 can be obviously improved, and meanwhile, the bursting strength of the PA6 can be improved, so that the PA is suitable for being applied to automobile carbon tank products.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a PA6 composition and a preparation method and application thereof.
Background
Energy conservation and emission reduction, environmental protection and light weight are the development direction of automobiles in the future. With the enforcement of China fuel consumption regulation and national six-standard regulation, more stringent requirements are particularly put on the emission of evaporative pollutants of an automobile fuel system. The carbon tank is a key part in an automobile fuel evaporation system, and special activated carbon with strong adsorption and desorption capacity for gasoline vapor is filled in the carbon tank to play a role in adsorbing and desorbing the gasoline vapor. As a core part of the fuel system, the design of the automobile carbon tank assembly is of great importance, and the quality of the design performance directly influences the evaporation emission value of the whole fuel system and the light weight technical level of the whole automobile.
At present, the materials used by the national six-carbon tank mainly adopt modified PA66, european and Japanese brands generally adopt non-reinforced PA66, and autonomous brands generally adopt glass fiber reinforced PA66. The PA66 material has the characteristics of high strength, excellent heat resistance, salt resistance, low fuel permeability and the like, and is widely applied to carbon tanks and peripheral parts. In the related patents disclosed, most of the technology focuses on the use of fuel tanks or fuel pipes, with certain differences from carbon cans: the former is suitable for extrusion or blow molding, and the latter is mainly injection molding, so that the same technology is difficult to realize in carbon tanks. In many prior art, the oil resistance of the material is improved by introducing other components, but the material is generally incompatible with nylon, and the material needs to be processed by adding a compatilizer, so that the comprehensive mechanical property of the material is greatly reduced besides increasing the cost. In addition, as described above, PA66 is still the main material of the peripheral parts of the engine represented by the carbon tank, but the current raw material synthesis technology of PA66 is still monopoly of the european and american enterprises such as inflight He Basi f, and belongs to the "neck-clamping" technology, the supply of which is not guaranteed, and the cost cannot be controlled.
The raw material source of the PA6 is sufficient, the domestic synthesis technology is mature, and compared with PA66, the PA6 has obvious cost advantage and smaller market price fluctuation range. At present, PA6 can not directly replace PA66 to prepare carbon tanks, and is mainly limited by the fact that the fuel permeability of PA6 is too high, and is critical to the emission standard of the national six-carbon tank. The method realizes breakthrough in six carbon tanks in China by replacing PA66 material with PA6 material, can realize cost optimization of carbon tank material in situ, and is also a bottleneck of urgent breakthrough in development of automobile industry.
Disclosure of Invention
The invention aims to provide a PA6 composition, which has the advantages of high fuel oil resistance, salt resistance and bursting strength.
Another object of the present invention is to provide a method for preparing the PA6 composition and use thereof.
The invention is realized by the following technical scheme:
the PA6 composition comprises the following components in parts by weight:
70 parts of PA6;
5-20 parts of PACM nylon;
10-50 parts of glass fiber;
the PACM nylon is obtained by copolymerizing 4' 4-diamino dicyclohexylmethane, dodecanedioic acid and adipic acid, wherein adipic acid units account for 5-20mol% of the total mole percentage of diacid units, and the weight average molecular weight range is 15000-25000.
The glass fiber can be added according to the actual demand, and the strength is increased along with the increase of the content of the glass fiber.
Preferably, 8-15 parts of PACM nylon in parts by weight; more preferably, 11-13 parts of PACM nylon.
The weight average molecular weight range of the PA6 is 20000-30000; preferably 22000 to 28000.
Preferably, the PACM nylon has a weight average molecular weight ranging from 17500 to 22500.
Preferably, adipic acid units in PACM nylon account for 10-15mol% of the total mole percent of diacid units.
PACM nylon can be a commercial product or a self-made product, and for more accurate experiments, self-made samples are adopted in the embodiment and the comparative example of the invention.
The PACM nylon was prepared as follows (monomer and catalyst from commercial sources in the preparation):
deionized water, dodecanedioic acid, adipic acid, 4-diamino dicyclohexylmethane and sodium hypophosphite (1% of the total mass of PACM nylon monomer) are sequentially added into an autoclave, and nitrogen is used for purging the air in the autoclave. Uniformly stirring, heating to 310 ℃ at the speed of 20 ℃/min, and continuously releasing gas to keep the pressure balance in the kettle, wherein the reaction time is 90min.
The PACM nylon weight average molecular weight test method comprises the following steps: the GPC method was used to test that 10% m-phenol-chlorobenzene was used as mobile phase and JD-102 and JD-103 organic gels were used as stationary phases.
In order to further improve the barrier property of the PA6 composition, the surface of the glass fiber is modified by an amino-containing silane coupling agent and polyurethane with the relative molecular weight of 1500-3000g/mol, and the specific method comprises the steps of sequentially coating the glass fiber on the surface of the glass fiber through a dipping tank containing the silane coupling agent and polyurethane as a dipping agent in a weight ratio of 30:70-50:50.
Whether an auxiliary agent is added or not can be determined according to actual requirements, and the content of the auxiliary agent can be 0-3 parts by weight; the auxiliary agent is one or more selected from heat stabilizer, lubricant and nucleating agent.
To further improve the heat stability, the heat stabilizer may be a copper halide.
To improve melt blending uniformity, the lubricant may be hyperbranched polyester, stearate, ethylene bis stearamide, polyethylene wax, and the like.
In order to improve crystallinity, the nucleating agent may be ultrafine talc (particle size range 10000-50000 mesh), PA22, montanic acid salts, or the like.
The preparation method of the PA6 composition comprises the following steps: uniformly mixing PA6 and PACM nylon according to the proportion, extruding and granulating by a double-screw extruder, adding glass fibers by side feeding, and obtaining the PA6 composition after traction, cooling, granulating and drying; wherein the set temperature of the double-screw extruder is 220-240 ℃ and the screw rotating speed is 300-400 rpm.
The use of the PA6 composition of the present invention for the preparation of carbon canisters.
The invention has the following beneficial effects
According to the invention, PACM nylon is introduced into the PA6, and because the PACM nylon is long carbon chain nylon containing an aromatic structure, the PACM nylon has good compatibility with the PA6, so that the barrier property (fuel resistance and salt resistance) of the PA6 can be obviously improved, and meanwhile, the bursting strength of the PA6 is also improved, so that the PA6 composition provided by the invention is suitable for being applied to automobile carbon tank products.
Drawings
Fig. 1: schematic of salt tolerance blush evaluation of examples and comparative examples.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
The sources of the raw materials used in the invention are as follows:
PA6-a: weight average molecular weight 22000, brand PA 6J 2400, origin polymerization cis;
PA6-B: weight average molecular weight 28000, brand PA 6M 2800, from Xinhuimeida;
PA6-C: weight average molecular weight 20000, brand PA 6J 2000, origin polymerization;
PA6-D: weight average molecular weight 30000, brand PA6 BL40H, source balm petrochemical.
PACM-A: weight average molecular weight 18000, adipic acid unit accounting for 10mol% of total mole percent of diacid unit, self-made;
PACM-B: weight average molecular weight 22000, adipic acid unit accounting for 15mol% of total mole percent of diacid unit, self-made;
PACM-C: the weight average molecular weight is 15000, adipic acid units account for 20mol percent of the total mole percent of diacid units, and the product is self-made;
PACM-D: weight average molecular weight 25000, adipic acid unit accounting for 5mol% of total mole percent of diacid unit, self-made;
PACM-E: weight average molecular weight 16000, adipic acid unit 2.5mol% of total mole percent of diacid unit, homemade;
PACM-F: the weight average molecular weight is 20000, the adipic acid unit accounts for 22.5mol percent of the total mole percent of the diacid unit, and the adipic acid unit is self-made;
PACM-G: weight average molecular weight 13500, adipic acid unit accounting for 5mol% of total mole percent of diacid unit, self-made;
PACM-H: weight average molecular weight 27000, adipic acid units account for 7.5mol% of the total mole percent of diacid units, homemade.
Glass fiber a: the trade mark ECS10-03-568H is from a huge stone group;
glass fiber B: the trade mark ECS10-03-568H is purchased for modification, and the polyurethane modification method comprises the following steps: the glass fiber A passes through a dipping tank containing an amino silane coupling agent and polyurethane with a relative molecular weight of 1800g/mol, and is dried at 80 ℃ and then coated on the surface of the glass fiber (the weight ratio of the silane coupling agent to the polyurethane is 40:60).
And (3) a lubricant: stearate, BS-3818, available from Huamintai.
Preparation of PA6 compositions of examples and comparative examples: uniformly mixing PA6, PACM nylon and a lubricant, extruding and granulating by a double-screw extruder, adding glass fibers by side feeding, and obtaining a PA6 composition after traction, cooling, granulating and drying; wherein the set temperature of the double-screw extruder is 220-240 ℃ and the screw rotating speed is 300-400 rpm.
The testing method comprises the following steps:
(1) Burst strength test: the injection molded parts of the blasting boxes were friction welded by the same process vibration (pressure 40MPa, amplitude 1mm, depth 1.2mm, time 3 s) and gas blasting test was performed at a 10kPa/s boost rate, and peak pressure at blasting was recorded.
(2) Oil absorption rate test: the PA6 composition is injection molded into a 60 x 2mm test piece, and is soaked in gasoline at normal temperature: and the absolute ethyl alcohol is mixed with the solution in the volume ratio of 9:1, the mixed solution is taken out after 1000H, and the mass increasing proportion after oil absorption is tested.
(3) Salt resistance test: the ISO 527 1A test piece was immersed in a 50wt% aqueous solution of calcium chloride at room temperature, and after leaving for 200H, the test piece was taken out to see whether the surface was whitish.
Table 1: examples 1-7 PA6 compositions component content (parts by weight) and test results
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 | |
| PA6-A | 70 | 70 | 70 | 70 | |||
| PA6-B | 70 | ||||||
| PA6-C | 70 | ||||||
| PA6-D | 70 | ||||||
| PACM-A | 10 | 10 | 10 | 10 | 5 | 8 | 11 |
| Glass fiber A | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
| Lubricant | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Burst strength/kPa | 427 | 414 | 408 | 407 | 392 | 400 | 438 |
| Oil absorption/% | 1.13 | 1.13 | 1.15 | 1.16 | 1.18 | 1.14 | 1.07 |
| Salt tolerance | Slightly blushing | Slightly blushing | Slightly blushing | Slightly blushing | Slightly blushing | Slightly blushing | No blushing |
As is clear from examples 1 to 4, PA6 preferably has a weight average molecular weight of 22000 to 28000, and has a lower oil absorption, a better salt tolerance and a highest burst strength.
As is clear from examples 1/5 to 10, the PACM nylon is preferably lower in oil absorption and better in salt resistance, and the bursting strength can be 441 to 449kPa even when the PACM nylon is added in 15 parts by 20 parts, but the oil absorption and salt resistance are inferior to those of the PACM nylon added in 11 to 13 parts.
Table 2: examples 8-14 PA6 compositions component contents (parts by weight) and test results
| Example 8 | Example 9 | Example 10 | Example 11 | Example 12 | Example 13 | Example 14 | |
| PA6-A | 70 | 70 | 70 | 70 | 70 | 70 | 70 |
| PACM-A | 13 | 15 | 20 | 10 | |||
| PACM-B | 10 | ||||||
| PACM-C | 10 | ||||||
| PACM-D | 10 | ||||||
| Glass fiber A | 30 | 30 | 30 | 30 | 30 | 30 | |
| Glass fiber B | 30 | ||||||
| Lubricant | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Burst strength/kPa | 452 | 449 | 441 | 453 | 400 | 437 | 446 |
| Oil absorption/% | 1.08 | 1.11 | 1.17 | 1.14 | 1.19 | 1.22 | 1.01 |
| Salt tolerance | No blushing | Slightly blushing | Slightly blushing | Slightly blushing | Slightly blushing | Slightly blushing | No blushing |
As is clear from examples 1/11-13, PACM nylon preferably has a weight average molecular weight of 17500-22500, adipic acid units account for 10-15mol% of the total mole percentage of diacid units, and has lower oil absorption and better salt tolerance.
As is evident from examples 1/14, it is preferable that the glass fiber is modified with a silane coupling agent and polyurethane.
Table 3: example 15 PA6 composition content of Each component (parts by weight) and test results
| Example 15 | |
| PA6-A | 70 |
| PACM-A | 20 |
| Glass fiber B | 50 |
| Lubricant | |
| Burst strength/kPa | 487 |
| Oil absorption/% | 0.83 |
| Salt tolerance | No blushing |
As is evident from examples 14 to 15, the PACM and glass fiber contents were increased, and the burst strength, salt resistance and oil resistance were all increased. Table 4: comparative example PA6 composition content of each component (parts by weight) and test results
| Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | Comparative example 6 | Comparative example 7 | Comparative example 8 | |
| PA6-A | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 70 |
| PACM-A | 2.5 | 25 | ||||||
| PACM-E | 10 | |||||||
| PACM-F | 10 | |||||||
| PACM-G | 10 | |||||||
| PACM-H | 10 | |||||||
| Glass fiber A | 30 | 30 | 30 | 30 | 30 | 30 | 30 | |
| Lubricant | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| Burst strength/kPa | 78 | 398 | 379 | 368 | 345 | 337 | 392 | 325 |
| Oil absorption/% | 2.03 | 1.78 | 1.21 | 1.31 | 1.14 | 1.24 | 1.31 | 1.00 |
| Salt tolerance | Severe blushing and cracking | Severe blushing | Slightly blushing | Obvious blushing | Slightly blushing | Obvious blushing | Obvious blushing | No blushing |
As is clear from comparative example 2, the conventional PA 6/glass fiber reinforced system has poor oil resistance and salt resistance, although the bursting strength can approach 400kPa, and cannot meet the requirements of automobile carbon tank products.
As is clear from comparative examples 3-6, the weight average molecular weight of PACM nylon and the total mole percentage of adipic acid units to diacid units are used as key parameters, and when the related parameters of PACM are not in the range of the invention, the technical effects of oil resistance, salt resistance and high bursting strength cannot be obtained at the same time.
Claims (9)
1. The PA6 composition is characterized by comprising the following components in parts by weight:
70 parts of PA6;
5-20 parts of PACM nylon;
10-50 parts of glass fiber;
the PACM nylon is obtained by copolymerizing 4' 4-diamino dicyclohexylmethane, dodecanedioic acid and adipic acid, wherein adipic acid units account for 5-20mol% of the total mole percentage of diacid units, and the weight average molecular weight range is 15000-25000;
the weight average molecular weight of the PA6 is in the range of 22000-28000.
2. PA6 composition according to claim 1, characterized in that it comprises, by weight, 8-15 parts of PACM nylon.
3. PA6 composition according to claim 2, characterized in that it comprises 11-13 parts by weight of PACM nylon.
4. The PA6 composition of claim 1 wherein said PACM nylon has a weight average molecular weight ranging from 17500 to 22500.
5. The PA6 composition of claim 1 wherein adipic acid units in PACM nylon are 10-15 mole percent of the total mole percent of diacid units.
6. The PA6 composition according to claim 1, wherein the surface of the glass fiber is modified with an amino-containing silane coupling agent and polyurethane having a relative molecular weight of 1500 to 3000, and the weight ratio of the amino-containing silane coupling agent to polyurethane is 30:70 to 50:50.
7. PA6 composition according to claim 1, characterized in that it further comprises 0-3 parts by weight of an auxiliary agent; the auxiliary agent is one or more selected from heat stabilizer, lubricant and nucleating agent.
8. A process for the preparation of a PA6 composition according to claim 1, characterized by the steps of: uniformly mixing PA6 and PACM nylon according to the proportion, extruding and granulating by a double-screw extruder, adding glass fibers by side feeding, and obtaining the PA6 composition after traction, cooling, granulating and drying; wherein the set temperature of the double-screw extruder is 220-240 ℃ and the screw rotating speed is 300-400 rpm.
9. Use of a PA6 composition according to any one of claims 1-7 for the preparation of a carbon canister.
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|---|---|---|---|---|
| US3389549A (en) * | 1966-01-17 | 1968-06-25 | Du Pont | Aromatic dicarbonyl sulfonate modified polycarbonamides |
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